Bluntnose sixgill sharks (Hexanchus griseus) normally live in the dark mid-ocean depths between 300 and 6000 ft (90 to 1870 m) down. This makes them inaccessible for live study most of the time. Luckily, a population of sixgills has been discovered breeding in shallow water off British Columbia. Although they are only active on cloudy days and at night divers are learning more about them.
